TROPHON. 321 



is generally diffused ; they occur in the same deposits, 

 and also in the Norwich Crag (Woodward), and Red 

 Crag (S. Wood). The existing distribution of the pre- 

 sent species is arctic and boreal, extending from Green- 

 land (Moller) to Bohuslan (Loven and Malm) in the 

 eastern hemisphere, and from Canada (D' Urban) to 

 Massachusetts Bay (Gould and Stimpson) in the western 

 hemisphere; depths recorded 35-120 f. 



The 2nd variety of this species corresponds with the 

 variety Gunneri of T. clathratus. For my largest speci- 

 men of the present species I am indebted to Mr. Rose, 

 who procured it by trawling off Yarmouth ; it is nine- 

 tenths of an inch in length, and has the usual number 

 of ribs. T. clathratus of the same size has only 14 ribs 

 on the body- whorl; it is a thinner and more tumid 

 shell, and attains far greater dimensions than our species. 

 T. clathratus is a characteristic fossil of all glacial and 

 post-glacial beds here and abroad ; in a recent or living 

 state it inhabits Spitzbergen (the extreme limit of the 

 European fauna), Iceland, Norway, and the Faroe Isles, 

 the coasts of Northern Asia southwards to Japan (A. 

 Adams), as well as Greenland, the eastern and western 

 coasts of North America (Fabricius, Gould, P. Carpenter, 

 and others), from the shore to 100 f. According to 

 Olafsen and Povelsen it was called by the Icelanders 

 " St. Peders-snekke," or St. Peter's snail; the tradition 

 or superstition in which this name originated seems to 

 have been lost. Mohr gave a somewhat similar verna- 

 cular name (" Peturs-kongr," or King Peter) for Fusus 

 Islandicus. 



Both species of Trophon have several synonyms ; but 

 those best known are Murex Bamffius of Montagu for 

 T. truncatus, and Fusus scalariformis of Gould for T. 

 clathratus. Murex Bamffius of Donovan includes the 



p5 



